Nickel Alloy 800H/HT

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


Nickel alloy 800H/HT is intended for high temperature structural applications. The high nickel content in its composition makes the alloys highly resistant to both carborisation and to embrittlement from precipitation of sigma phase.

The following section will discuss in detail about nickel alloy 800H/HT.

Chemical Composition

The chemical composition nickel alloy 800H/HT is outlined in the following table.

Element Content (%)
Iron, Fe 39.5
Nickel, Ni 30-35
Chromium, Cr 19-23
Manganese, Mn 1.5
Silicon, Si 1
Copper, Cu 0.75
Titanium, Ti 0.25-0.6
Aluminum, Al 0.25-0.6
Carbon, C 0.06-0.1
Sulfur, S 0.015

Physical Properties

The following table shows the physical properties of nickel alloy 800H/HT.

Properties Metric Imperial
Density 7.94 g/cm3 0.29 lb/in3

Mechanical Properties

The mechanical properties of nickel alloy 800H/HT are displayed in the following table.

Properties Metric Imperial
Tensile strength 448 MPa 65 ksi
Yield strength 172 MPa 25 ksi
Elongation at break 20% 20%

Thermal Properties

The thermal properties of nickel alloy 800H/HT are given in the following table

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 14.4 µm/m°C 8 µin/in°F
Thermal conductivity 11.5 W/mK 79.735².°F


The following are the list of applications of nickel alloy 800H/HT:

  • Ethylene furnace quench boilers
  • Super-heater and re-heaters in power plants
  • Industrial furnaces
  • Chemical and petrochemical processing
  • Hydrocarbon cracking
  • Pressure vessels

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